Taillight for a bicycle



FIG. 1 is a front view of a taillight for a bicycle showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a perspective view thereof; and,

FIG. 7 is an exploded perspective view thereof. 

The ornamental design for taillight for a bicycle, as shown and described. 